Is there anything I need to know to make this happen? My DGrD15 (large 6' tall) would be nearly impossible for me to push through the parks in a regular wheelchair due to my own limitations. She recently had an emergency knee surgery and her Dr cleared her to go on our long-planned trip to WDW, but advised she use a scooter and avoid too much walking (she can do short distances). Does Disney allow people under age 18 to operate scooters in the parks? Will I need a letter from her Dr? I am scrambling to make this trip possible - I would rent an off site scooter since we are not going into the parks until late-day at a busy time of year and I would worry they would be out of them. TIA any advice!